Unix epoch time counts the number of seconds that have elapsed since January 1, 1970 (UTC). This article introduces the concept while showcasing every block type our editor supports.
What is the Unix Epoch?
The epoch is a fixed starting point for time calculations. Systems store timestamps as integers relative to this baseline, simplifying math across languages and platforms.
Because the value is just a number, it is easy to serialize, compare, and sort. It also avoids localization issues until the final rendering step, when you convert it back into a human-readable time string.
Store timestamps as integers so calculations stay fast and predictable.
Document whether you use seconds, milliseconds, or nanoseconds.
Convert to local time only at presentation time.
Example: Current Epoch
On February 2, 2024 at 12:00 UTC, the epoch value is 1706875200. You can check this quickly in the terminal by running date +%s.
Pro tip: milliseconds vs seconds
Some languages (like JavaScript) represent the epoch in milliseconds. Others (like Go or Python) default to seconds. Convert carefully when storing or comparing.
Working with epoch timestamps
A quick workflow for logging, storing, and presenting epoch time.
- Step 1
Capture the timestamp
Use your runtime to grab the current epoch immediately as data arrives.
Commanddate +%s - Step 2
Store normalized values
Persist the integer as-is in your database so all services speak the same format.
- Step 3
Format on output
Only convert to a formatted string when rendering for a user in a specific time zone.
Useful epoch utilities
Keep these references handy when working across different runtimes.
Epoch converter CLI
Convert between seconds and milliseconds with a single flag.
cliISO <-> epoch guide
Documentation on translating RFC 3339 timestamps to raw epoch values.
docsEpoch best practices thread
Community discussion on storing and auditing time-series data.
communityEpoch milestones
Reached Sep 2001
One billion seconds after the epoch.
Hit Nov 2001
First trillion milliseconds since start.
Jan 2038
Signed 32-bit overflow moment.
Epoch time is simple on purpose—keep it raw at rest, and you can bend it to any format later.
— Dennis Ritchie, Unix co-creator (Bell Labs)
Read more: Read the Unix history notes
Frequently asked questions
Common questions teams ask when migrating legacy systems.
What happens in 2038?
Signed 32-bit integers overflow, so systems must migrate to 64-bit or alternative representations before January 19, 2038.
Does epoch time account for leap seconds?
POSIX time ignores leap seconds. Some systems maintain tables to adjust when converting to human-readable timestamps.
Our engineers can review your time-series pipeline in detail.
STAY AHEAD OF TIME DRIFT
Review your epoch handling with MistServer
From ingest pipelines to analytics dashboards, we help teams audit and future-proof their time-series architecture.
With these building blocks you can track time precisely, avoid future overflow issues, and keep your monitoring trustworthy.